Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John W. Ostrowski, MD

Anesthesiology Physician in Wilmington, DE · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1790770956

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Registry record

Entity type Individual (Type 1)

Name John W. Ostrowski

Credential MD

Sex Male

Practice address 1600 Rockland Road, Wilmington, DE, 19803

Phone (302) 651-4000

Fax (302) 651-5345

Enumeration date Sep 14, 2005

Last updated in NPPES Sep 26, 2011

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License 196716 (NY) Secondary

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License C10008937 (DE) Primary

207LP3000X Pediatric Anesthesiology Physician Allopathic & Osteopathic Physicians · License C10008937 (DE) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
02111782	Medicaid	NY	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

What specialty is John Ostrowski?

John Ostrowski is registered in NPPES with the primary taxonomy of Anesthesiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-26.